BARIUM FLUORIDE, EXTRA PURE
Barium fluoride
CAS: 7787-32-8
Molecular Formula: BaF2
BARIUM FLUORIDE, EXTRA PURE - Names and Identifiers
| Name | Barium fluoride |
| Synonyms | Barium fluoride Barium fluoride, extra pure BARIUM FLUORIDE, EXTRA PURE Barium fluoride trace metals basis Barium fluoride, Puratronic, (metals basis) |
| CAS | 7787-32-8 |
| EINECS | 232-108-0 |
| InChI | InChI=1/Ba.2FH/h;2*1H/q+2;;/p-2 |
BARIUM FLUORIDE, EXTRA PURE - Physico-chemical Properties
| Molecular Formula | BaF2 |
| Molar Mass | 175.326 |
| Density | 4.89 g/mL at 25 °C(lit.) |
| Melting Point | 1354℃ |
| Boling Point | 19.5°C at 760 mmHg |
| Flash Point | 2260°C |
| Water Solubility | 1.6 g/L (20℃) |
| Vapor Presure | 922mmHg at 25°C |
| Refractive Index | 1.4741 |
| Physical and Chemical Properties | Characters colorless cubic fine crystals. melting point 1355 ℃ relative density 4.89 solubility slightly soluble in hot water, soluble in acid and ammonium chloride. |
| Use | For electronics, instrumentation, metallurgical industry, preservatives |
BARIUM FLUORIDE, EXTRA PURE - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R20/22 - Harmful by inhalation and if swallowed. |
| UN IDs | UN 2811 |
BARIUM FLUORIDE, EXTRA PURE - Upstream Downstream Industry
| Raw Materials | Hydrofluoric Acid Hydrofluoric Acid Barium carbonate |
BARIUM FLUORIDE, EXTRA PURE - Safety
Open Data Verified Data
toxic. It has a strong stimulating effect on eyes, skin, mucous membranes and upper respiratory tract. Should be stored in a ventilated, dry, clean warehouse, sealed preservation, pay attention to moisture. Do not store and mix with acids and food. Transport should be protected from rain and sun. When loading and unloading should be light to prevent packaging damage.
Last Update：2022-01-01 09:06:29
BARIUM FLUORIDE, EXTRA PURE - Nature
| storage conditions | Store at 5°C to 30°C. |
| solubility | 1.2g/l |
| morphology | random crystals |
| color | White |
| Specific gravity | 4.89 |
| water solubility | 1.6 g/L (20 °C) |
| sensitivity | Hygroscopic |
| Merck | 14,974 |
| Ksp precipitation equilibrium constant | pKsp: 6.74 |
| stability | Stable. Incompatible with acids. |
| InChIKey | OYLGJCQECKOTOL-UHFFFAOYSA-L |
| NIST chemical information | Barium fluoride(7787-32-8) |
| EPA chemical information | Barium fluoride (BaF2) (7787-32-8) |
Last Update：2024-04-10 22:29:15
BARIUM FLUORIDE, EXTRA PURE - Uses and synthesis methods
overview
Barium fluoride, colorless and transparent cubic crystal; Slightly soluble in water, soluble in hydrochloric acid, nitric acid and hydrofluoric acid, and also soluble in ammonium chloride aqueous solution; It is obtained by the action of barium carbonate and hydrofluoric acid; It has the characteristics of good moisture resistance, high use temperature and good luminous performance. It can be used as a window material or other optical components for carbon dioxide and other devices and the whole machine. Barium fluoride crystals with scintillation slow component suppression filters can be used in nuclear medicine, high-energy physics, physical exploration and & gamma; ray astronomy.
in addition, barium fluoride can also be used to make optical glass, motor brushes, vacuum coating, laser generator, optical fiber, infrared light-transmitting film, welding flux, enamel manufacturing, solid lubricants, preservatives and pesticides, etc.
physical and chemical properties
toxic! Proportion 4.89. Melting point 1353 ℃(1280 ℃)(1355 ℃). Boiling point 2137 ℃. Mohs hardness 3.5, with wide light transmission range, high transmittance, water resistance and organic solvent resistance at room temperature; Chemical stability, good mechanical properties and other characteristics. Slightly soluble in water, soluble in hydrochloric acid, nitric acid and hydrofluoric acid, and also soluble in ammonium chloride aqueous solution. It is highly corrosive. It is stable at room temperature, but it starts to decompose into barium oxide when heated to 1000 ℃ in air.
Preparation method
1. Dry method
The dry method is also called the solid-phase synthesis method. It uses barium fluorosilicate to decompose into product barium fluoride and silicon tetrafluoride gas at high temperature. The raw material barium fluorosilicate can be obtained from fluosilicate, a by-product of the phosphate fertilizer industry. After ammonium, it reacts with barium hydroxide or barium carbonate, and the silicon tetrafluoride gas is absorbed and reused.
Advantages and disadvantages: the raw materials used are easy to obtain, the price is low, the preparation process is simple, the required equipment is less, the reaction by-products are easy to treat, the production process has no waste water, waste liquid discharge, no secondary pollution, and has good Economic and environmental benefits. However, the temperature required for thermal decomposition is high, the energy consumption is large, and the production equipment is high. When barium fluosilicate is pyrolyzed at high temperature, the heat transfer is uneven, which is easy to cause wall formation, which increases energy consumption and also affects the purity of the final solid product. The use of fluidized bed for thermal decomposition can solve this problem.
2. Wet
Use hydrogen fluoride as the fluorine source: use barium carbonate or barium hydroxide to react directly or indirectly with hydrofluoric acid. Advantages and disadvantages: the production process is relatively mature, the utilization rate of raw materials is high, the reaction produces by-product gas and water, barium fluoride is not affected by other ions when crystallizing, and it is easy to produce products with higher purity from high purity raw materials. However, the equipment is seriously corroded, and a large amount of hydrofluoric acid is required directly or indirectly during production. Hydrofluoric acid is mainly produced by the reaction of fluorite and sulfuric acid. Now China has increased its efforts to restrict fluorite mining, and the price of the corresponding hydrofluoric acid will inevitably rise, which will affect the production cost of the process. In addition, a large amount of mother liquor is discharged in the production process, which puts great pressure on environmental protection.
Using soluble salt as the fluorine source: Using the low solubility of barium fluoride in aqueous solution, the soluble barium salt solution reacts with the soluble fluoride salt solution to generate barium fluoride precipitate. The reaction equation is as follows:
Ba2++2F-→BaF2↓
For example, ammonium fluoride is used as the fluorine source, and barium chloride solution and ammonium fluoride are heated and reacted in a water bath to generate barium fluoride precipitate.
BaCl2+NH4F→BaF2↓+2NH4Cl
the specific operation steps are: weigh a certain amount of BaCl2 · 2H2O and dissolve it in distilled water, and heat the solution in a constant temperature water bath at a set temperature. A certain amount of ammonium fluoride powder is quickly added to the barium chloride solution and stirred. After a certain period of reaction, filter, wash the filter cake and dry it.
advantages and disadvantages: the production process conditions are mild, the raw materials are mostly from fluorine sources and soluble barium salts produced by other industries, the price is low, the cost of producing barium fluoride is low, and the added value of the products is high. However, barium fluoride may be mixed with other metal ions or anions during precipitation, and the product purity is not high. Similarly, the production process is accompanied by a large amount of washing liquid discharge, environmental protection pressure is greater.
application
1. It can be used in enamel preservative and electronics, instrumentation, metallurgy and other industries.
2. Used for metal heat treatment, manufacturing glass, and used as flux and light barrier in glass and enamel.
3. It can be used as a window material for lasers such as hydrogen fluoride, deuterium fluoride, and Co.
4. It can be used as a window material or other optical element for devices such as carbon dioxide and the whole machine.
5. Barium fluoride crystals with scintillation light slow component suppression filters can be used in nuclear medicine, high-energy physics, physical exploration and & gamma; ray astronomy.
Solubility in water (g/100ml)
Dissolved grams per 100 ml of water at different temperatures (℃):
0.159g/10℃;0.16g/20℃;0.162g/30℃
Toxicity
Fluoride can precipitate calcium, causing calcium and phosphorus metabolism disorders and bone sclerosis. In acute poisoning, leukopenia causes damage to the muscles of the central nervous system, gastrointestinal tract and skin. In case of oral poisoning, 2% soda solution (1% calcium chloride solution or lime water is better) can be used, gastric lavage can be fully performed through gastric tube, and atropine (0.1% solution mL) can be repeatedly administered subcutaneously. Cardiovascular system drugs are given according to symptoms. The maximum allowable concentration is 0.2 mg/m3. During operation, you must wear a gas-proof mask to prevent dust inhalation. You must wear rubber gloves, helmets or other dust-proof caps, and wear waterproof and dustproof work clothes. The equipment should be sealed and dust removal should be paid attention. The concentration of barium fluoride in the air should be checked regularly. Local and comprehensive ventilation is adopted.
chemical properties
colorless cubic fine crystals. Slightly soluble in hot water, soluble in acid and ammonium chloride.
use
1. Used in the manufacture of motor brushes, optical glass, optical fibers, laser generators, fluxes, coatings and enamel, wood preservatives and pesticides, etc.
2. Used in the manufacture of motor brushes, optical glass, optical fibers, laser generators, fluxes, coatings and enamel. Used as wood preservative and insecticide.
3. Used in electronics, instrumentation, metallurgical industry, preservative
4. Preservatives. Metal heat treatment. Ceramics. Enamel. Making glass. Metallurgy. Industries such as meters.
production method
Put barium carbonate and water into a pulp, add human hydrofluoric acid to react, control the Ph value of the reaction end point, and keep it unchanged. The product is filtered, dried and crushed, which is the finished product of barium fluoride. Its
BaCO3+2HF→BaF2+CO2↑+H2O
category
toxic substances
toxicity classification
High toxicity
acute toxicity
oral administration-rat LD50: 250 mg/kg; Abdominal injection-mouse LD50: 29.91 mg/kg
flammability hazard characteristics
Thermal decomposition of toxic fluoride and barium oxide smoke
storage and transportation features
The warehouse is ventilated and dry at low temperature; stored and transported separately from food
fire extinguishing agent
Water, sand
occupational standards
TWA 0.5 mg (barium)/m3; TWA 2.5 mg (fluorine)/m3
Last Update：2024-04-10 22:41:30
BARIUM FLUORIDE, EXTRA PURE - Security information
| WGK Germany | 1 |
| RTECS number | CQ9100000 |
| Hazard Note | Toxic |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | III |
| customs code | 28261990 |
| Toxicity | LD50 orally in Rabbit: 250 mg/kg |
Last Update：2024-04-10 22:29:15
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